Combining two strings together (not concatenation)

[DreamingInsanity]

It doesn't make sense. The first string is 13 characters long, and the second string is 15 characters long. The final string is 16 characters long. How do you know how long the final string should be, or where the 4 should be in it?

Sorry, that was a mistake, they should all be 15 characters long. Where the 4 is placed depends on what is reteurned from the previous functions. It isn't random it just moves left or right in the string. (My previous thread is pretty much what it is.)
For now, leave it in the centre of the string.

Dream